Merge pull request #9 from mayooot/feat/union-patch-and-version-control

docs: update some text

Author: mayooot

README.md

@@ -115,7 +115,9 @@ and implement the function of rollback to the specified version.
 Select any of the following.
 
 * Import [gpu-docker-api-en.openapi.json](api%2Fgpu-docker-api-en.openapi.json) to [ApiFox](https://apifox.com).
-* View [gpu-docker-api-en.html](api%2Fgpu-docker-api-en.html) or [gpu-docker-api-en.md](api%2Fgpu-docker-api-en.md).
+* View [gpu-docker-api-en.md](api%2Fgpu-docker-api-en.md).
+* View this [online api](https://apifox.com/apidoc/shared-cca36339-a3f1-4f6b-b8fe-4274ef3529ec), but it can expire at
+  any time.
 
 ## Environmental Preparation